Carrier 48TC**16 installation instructions Positioning on Curb, Retrofit Installation Dimensions

48TC**16

Positioning on Curb —

For full perimeter curbs CRRFCURB074A00 and 075A00, the clearance between the roof curb and the front and rear base rails should be 1/4 in (6.4 mm). The clearance between the curb and the end base rails should be 1/2 in (13 mm). For retrofit applications with curbs CRRFCURB003A01 and 4A01, the unit should be position as shown in Fig. 6. Maintain the 15.5 in (394 mm) and 8 5/8 in (220 mm) clearances and allow the 22 5/16 in (567 mm) dimension to float if necessary.

C10003

Fig. 6 - Retrofit Installation Dimensions

If the alternative condensate drain location through the bottom of the unit is used in conjunction with a retrofit curb, the hole in the curb must be moved 12.5 in (320 mm) towards the duct end of the unit. (See Fig. 7.)

Original	New Position
Position	(moved 12.5 in.)
	C10904

Fig. 7 - Alternative Condensate Drain Hole Positions

Although unit is weatherproof, guard against water from higher level runoff and overhangs.

IMPORTANT:

If the unit has the factory-installed Thru-the-Base option, make sure to complete installation of the option before placing the unit on the roof curb.

See the following sections:

SFactory-Option Thru-Base Connections (Gas Connection) on page 11

SFactory-Option Thru-Base Connections (Electrical Connections) on page 17

NOTE: If gas and/or electrical connections are not going to occur at this time, tape or otherwise cover the fittings so that moisture does not get into the building or conduit in the interim.

Remove all shipping materials and top skid. Remove extra center post from the condenser end of the unit so that the condenser end of the unit matches Figs. 26 and 27. Recycle or dispose of all shipping materials.

Step 7 — Convert to Horizontal and Connect Ductwork (when required)

Unit is shipped in the vertical duct configuration. Unit without factory-installed economizer or return air smoke detector option may be field-converted to horizontal ducted configuration using accessory CRDUCTCV001A00. To convert to horizontal configuration, remove screws from side duct opening covers and remove covers.

Discard the supply duct cover. Install accessory CRDUCTCV001A00 to cover the vertical supply duct opening. Use the return duct cover removed from the end panel to cover the vertical return duct opening.

Field-supplied flanges should be attached to horizontal duct openings and all ductwork should be secured to the flanges. Insulate and weatherproof all external ductwork, joints, and roof or building openings with counter flashing and mastic in accordance with applicable codes.

Do not cover or obscure visibility to the unit’s informative data plate when insulating horizontal ductwork.

C06108

Fig. 8 - Horizontal Conversion Panels

8